2005 MY OBD System Operation Summary for Gasoline Engines
2005 MY OBD System Operation Summary for Gasoline Engines 2005 MY OBD System Operation Summary for Gasoline Engines
1#4;!In this phase, the EONV test is considered complete for this key-off cycle. The resultant peak pressure and peakvacuum are stored along with total test time and other information. This information is sent to the mainmicroprocessor via CAN at the next engine start. During this phase, the CVS is commanded open and theelectrical components performing the EONV test are shutdown to prevent any further power consumption.;0+During the EONV test, several parameters are monitored to abort the EONV test under certain conditions. Theprimary abort conditions are instantaneous changes in tank pressure and fuel level. They are used to detectrefuel events and rapidly open the CVS upon detection of them. A list of abort conditions is given below.::Test results are transferred to the main microprocessor upon detection where they are processed todetermine if MIL illumination should occur. Because of the inherent variability in vapor temperaturechanges and fuel volatility, results from multiple EONV runs are normalized and averaged todetermine if a malfunction should be set. An average of four key-off EONV runs are used to determinea malfunction. If two malfunctions are set in a row, the MIL will be illuminated. Using this approach, atotal of eight, key-off EONV runs will be required to illuminate the MIL.FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 30 OF 131
1#.2;P0 = Phase 0, Stabilization Phase – With CVS open, Tank Pressure is allowed to stabilize. A fuel volatility test isperformed and FTPT offset correction is learned if volatility test passes.P1 = Phase 1, First Test Phase – CVS is closed and pressure peaks below positive pass threshold sending test toPhase 2. If the positive pass threshold were exceeded, the test would have completed and a pass would havebeen recorded.P2 = Phase 2, Transition Phase – CVS is opened and a second stabilization phase occurs. A second FTPT offsetis learned during this time.P3 = Phase 3, Second Test Phase – CVS is closed again and a vacuum develops that eventually exceeds thenegative pass threshold. When this occurs the test proceeds to Phase 4 test complete.P4 = Phase 4, Test Compete – CVS opens (not pictured in above data file), results are recorded, and stay-aliveelectronics shutdown.FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 31 OF 131
- Page 1: Table of ContentsIntroduction - OBD
- Page 4 and 5: !The Catalyst Efficiency Monitor us
- Page 6 and 7: TYPICAL INDEX RATIO CATALYST MONITO
- Page 8 and 9: There are three different misfire m
- Page 10 and 11: 0#1The acceleration that a piston u
- Page 12 and 13: J1979 Misfire Mode $06 DataTest ID
- Page 14 and 15: 0$Secondary air systems typically u
- Page 16 and 17: 201 34536/#/Vehicles that meet enha
- Page 18 and 19: 0.040” EVAP Monitor Operation:DTC
- Page 20 and 21: 201 3536/#/Some vehicles that meet
- Page 22 and 23: slosh. If the monitor aborts, it wi
- Page 24 and 25: 0.020” EVAP Monitor Operation:DTC
- Page 26 and 27: Test ID Comp ID Description for J18
- Page 28 and 29: Ford's EONV implementation for Cali
- Page 32 and 33: 0.020” EONV EVAP Monitor Operatio
- Page 34 and 35: 201!!#/Additional malfunctions that
- Page 36 and 37: Fuel Tank Pressures Sensor Offset C
- Page 38 and 39: :As fuel system components age or o
- Page 40 and 41: -:-The time between HO2S switches i
- Page 42 and 43: $-A functional test of the rear HO2
- Page 44 and 45: -- 3 amps, (NTK)< 0.400 amps or > 3
- Page 46 and 47: 1:$The Delta Pressure Feedback EGR
- Page 48 and 49: If an EGR system malfunction is det
- Page 50 and 51: After the vehicle has warmed up and
- Page 52 and 53: 1:$In the 2002.5 MY, Ford introduce
- Page 54 and 55: The ESM may provide the PCM with a
- Page 56 and 57: Next, the differential pressure ind
- Page 58 and 59: I/M Readiness IndicationIf the infe
- Page 60 and 61: The Stepper Motor EGR Monitor consi
- Page 62 and 63: Note: BARO is inferred at engine st
- Page 64 and 65: $. 6The Electric Stepper Motor EGR
- Page 66 and 67: The MAP sensor is also checked for
- Page 68 and 69: When the entry conditions for the f
- Page 70 and 71: 1!2Ford plans to comply with the PC
- Page 72 and 73: ETC System Failure Mode and Effects
- Page 74 and 75: ;#11!%;11!)The purpose of the TPPC
- Page 76 and 77: Currently, vehicles use either an E
- Page 78 and 79: Fuel Rail Pressure Sensor Check Ope
1#.2;P0 = Phase 0, Stabilization Phase – With CVS open, Tank Pressure is allowed to stabilize. A fuel volatility test isper<strong>for</strong>med and FTPT offset correction is learned if volatility test passes.P1 = Phase 1, First Test Phase – CVS is closed and pressure peaks below positive pass threshold sending test toPhase 2. If the positive pass threshold were exceeded, the test would have completed and a pass would havebeen recorded.P2 = Phase 2, Transition Phase – CVS is opened and a second stabilization phase occurs. A second FTPT offsetis learned during this time.P3 = Phase 3, Second Test Phase – CVS is closed again and a vacuum develops that eventually exceeds thenegative pass threshold. When this occurs the test proceeds to Phase 4 test complete.P4 = Phase 4, Test Compete – CVS opens (not pictured in above data file), results are recorded, and stay-aliveelectronics shutdown.FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 31 OF 131
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